stuff

1 files changed, 225 insertions, 0 deletions

diff --git a/src/libsystemd/libsystemd-internal/sd-id128/sd-id128.c b/src/libsystemd/libsystemd-internal/sd-id128/sd-id128.c
new file mode 100644
index 0000000000..cda3e9f0df
--- /dev/null
+++ b/src/libsystemd/libsystemd-internal/sd-id128/sd-id128.c
@@ -0,0 +1,225 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <systemd/sd-id128.h>
+
+#include "fd-util.h"
+#include "hexdecoct.h"
+#include "io-util.h"
+#include "macro.h"
+#include "random-util.h"
+#include "util.h"
+
+_public_ char *sd_id128_to_string(sd_id128_t id, char s[SD_ID128_STRING_MAX]) {
+        unsigned n;
+
+        assert_return(s, NULL);
+
+        for (n = 0; n < 16; n++) {
+                s[n*2] = hexchar(id.bytes[n] >> 4);
+                s[n*2+1] = hexchar(id.bytes[n] & 0xF);
+        }
+
+        s[32] = 0;
+
+        return s;
+}
+
+_public_ int sd_id128_from_string(const char s[], sd_id128_t *ret) {
+        unsigned n, i;
+        sd_id128_t t;
+        bool is_guid = false;
+
+        assert_return(s, -EINVAL);
+        assert_return(ret, -EINVAL);
+
+        for (n = 0, i = 0; n < 16;) {
+                int a, b;
+
+                if (s[i] == '-') {
+                        /* Is this a GUID? Then be nice, and skip over
+                         * the dashes */
+
+                        if (i == 8)
+                                is_guid = true;
+                        else if (i == 13 || i == 18 || i == 23) {
+                                if (!is_guid)
+                                        return -EINVAL;
+                        } else
+                                return -EINVAL;
+
+                        i++;
+                        continue;
+                }
+
+                a = unhexchar(s[i++]);
+                if (a < 0)
+                        return -EINVAL;
+
+                b = unhexchar(s[i++]);
+                if (b < 0)
+                        return -EINVAL;
+
+                t.bytes[n++] = (a << 4) | b;
+        }
+
+        if (i != (is_guid ? 36 : 32))
+                return -EINVAL;
+
+        if (s[i] != 0)
+                return -EINVAL;
+
+        *ret = t;
+        return 0;
+}
+
+static sd_id128_t make_v4_uuid(sd_id128_t id) {
+        /* Stolen from generate_random_uuid() of drivers/char/random.c
+         * in the kernel sources */
+
+        /* Set UUID version to 4 --- truly random generation */
+        id.bytes[6] = (id.bytes[6] & 0x0F) | 0x40;
+
+        /* Set the UUID variant to DCE */
+        id.bytes[8] = (id.bytes[8] & 0x3F) | 0x80;
+
+        return id;
+}
+
+_public_ int sd_id128_get_machine(sd_id128_t *ret) {
+        static thread_local sd_id128_t saved_machine_id;
+        static thread_local bool saved_machine_id_valid = false;
+        _cleanup_close_ int fd = -1;
+        char buf[33];
+        unsigned j;
+        sd_id128_t t;
+        int r;
+
+        assert_return(ret, -EINVAL);
+
+        if (saved_machine_id_valid) {
+                *ret = saved_machine_id;
+                return 0;
+        }
+
+        fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+        if (fd < 0)
+                return -errno;
+
+        r = loop_read_exact(fd, buf, 33, false);
+        if (r < 0)
+                return r;
+        if (buf[32] !='\n')
+                return -EIO;
+
+        for (j = 0; j < 16; j++) {
+                int a, b;
+
+                a = unhexchar(buf[j*2]);
+                b = unhexchar(buf[j*2+1]);
+
+                if (a < 0 || b < 0)
+                        return -EIO;
+
+                t.bytes[j] = a << 4 | b;
+        }
+
+        saved_machine_id = t;
+        saved_machine_id_valid = true;
+
+        *ret = t;
+        return 0;
+}
+
+_public_ int sd_id128_get_boot(sd_id128_t *ret) {
+        static thread_local sd_id128_t saved_boot_id;
+        static thread_local bool saved_boot_id_valid = false;
+        _cleanup_close_ int fd = -1;
+        char buf[36];
+        unsigned j;
+        sd_id128_t t;
+        char *p;
+        int r;
+
+        assert_return(ret, -EINVAL);
+
+        if (saved_boot_id_valid) {
+                *ret = saved_boot_id;
+                return 0;
+        }
+
+        fd = open("/proc/sys/kernel/random/boot_id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+        if (fd < 0)
+                return -errno;
+
+        r = loop_read_exact(fd, buf, 36, false);
+        if (r < 0)
+                return r;
+
+        for (j = 0, p = buf; j < 16; j++) {
+                int a, b;
+
+                if (p >= buf + 35)
+                        return -EIO;
+
+                if (*p == '-') {
+                        p++;
+                        if (p >= buf + 35)
+                                return -EIO;
+                }
+
+                a = unhexchar(p[0]);
+                b = unhexchar(p[1]);
+
+                if (a < 0 || b < 0)
+                        return -EIO;
+
+                t.bytes[j] = a << 4 | b;
+
+                p += 2;
+        }
+
+        saved_boot_id = t;
+        saved_boot_id_valid = true;
+
+        *ret = t;
+        return 0;
+}
+
+_public_ int sd_id128_randomize(sd_id128_t *ret) {
+        sd_id128_t t;
+        int r;
+
+        assert_return(ret, -EINVAL);
+
+        r = dev_urandom(&t, sizeof(t));
+        if (r < 0)
+                return r;
+
+        /* Turn this into a valid v4 UUID, to be nice. Note that we
+         * only guarantee this for newly generated UUIDs, not for
+         * pre-existing ones. */
+
+        *ret = make_v4_uuid(t);
+        return 0;
+}